Do biotin supplements increase hair growth and strength? There many websites selling biotin suplements claiming that they will make hair grow stronger and faster. Here are two examples: Hair Growth Vitamin Bio-info Hair Growth Biotin deficency is shown to cause some problems including hair loss. But a deficiency must be extremely rare: recommended doses vary up to 25mcg, which is easily gotten from an egg white. Supplements are generally sold with 3000-5000mcg per capsule. **Do biotin supplements increase hair growth and strength?**

Biotin deficiency seems indeed to be rare. As with almost all vitamin supplementation, it's probably better to not take any unless you know you have a specific deficiency.

As expected, the sites you provide are full in anecdotal evidence and short on hard evidence, so stick with the Null Hypothesis until proven otherwise.

**Very** much recommended reading on the vitamin supplementation issue